Anaerobic co-digestion of sugar beet tops silage and dairy cow manure under thermophilic condition

Abstract

The effects of co-digesting different proportions of sugar beet tops (SBT) silage (40, 60, 80 and, 100 %, wet weight basis) with cow manure and duration of storage of two types of SBT silage (silage I: storage time of 120 days and silage II: storage time of 210 days) on digester performance in terms of biogas production and volatile solids (VS) reduction were investigated. The highest methane (CH 4 ) yields were obtained at the 40 % proportion treatments and were 0.422 and 0.377 l/g VS for silage I and II, respectively. The digestion systems failed at 80 and 100 % proportions of silage I and 100 % proportion of silage II. Furthermore, 40 % proportion treatments presented highest VS reductions among manure-silage mixtures (57.0 % for silage I and 57.4 % for silage II) while the control treatment (manure only) had the highest VS reduction (65.0 %) among all the treatments. Based on the results, the 40 % proportion of SBT silage was most efficient for methane production. Comparison of digester performance at 40 and 60 % proportions showed that no remarkable differences were observed between silage I and II, indicating that duration of storage of SBT did not have any appreciable effect on digester performance.

Anaerobic co‐digestion of dairy manure and Japanese knotweed (Fallopia japonica) under thermophilic condition: Optimal ratio for biochemical methane production

“…(1) = 2.71828, R max is the maximum specific methane production rate (ml CH 4 /gVS day), M is the methane production potential (ml CH 4 /gVS), and λ is the lag phase time (day). The parameters in the equation ( M , R max and λ) were estimated by the least squares method using the Solver Function of Microsoft Office Excel 2010 (Ohuchi et al., 2015).…”

Enhancement of Methane Production in Thermophilic Anaerobic Co-Digestion of Exhausted Sugar Beet Pulp and Pig Manure

“…Aboudi et al [40] found an optimal ratio of 32:68 with an SMP of 494 mL CH 4 /gVS added at the mesophilic range. Ohuchi et al [6] obtained an SMP of 377-422 mL CH 4 /gVS added for anaerobic co-digestion of cow manure with ensiled sugar beet tops at the proportion of 40%. The maximum SMP found for the mixture 25:75 in this work was approximately 11 times higher than for the mixture 0:100 (PM alone) and 5 times higher than 100:0 (ESBP alone), highlighting the synergy of the co-digestion of both substrates.…”

“…An interesting by-product generated in the process of sugar extraction from sugar beet (Beta vulgaris), is the exhausted sugar beet pulp (ESBP), which has the following composition-24%-32% of hemicellulose, 22%-30% of cellulose, 3%-4% of lignin, and 24%-32% of pectin [3]. Therefore, ESBP is a suitable substrate for biogas production, through the anaerobic digestion process (AD) [4][5][6]. The use of biogas produced from ESBP could generate economic and environmental benefits for energy-intensive consumers, such as sugar beet industries and, hence, contribute to the circular economy.…”

Effect of Replacing Berseem Hay by Dried Sugar Beet Tops on Performance of Friesian Calves

“…Going by this estimate, it is evident that several tons of SBT are produced from sugar beet cultivation and they could be an additional source of revenues for the farmer. SBT are valuable livestock feed (Ohuchi et al, 2015). There are some problems in using fresh sugar beet tops (FSBT) because it's high in moisture, potassium and oxalic acid content which lead to diarrhea and must be taken in consideration when used in animal feeding and ration formulation (Bendary et al, 1992;Senara, 2006).…”